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Financial Instruments - Summary Of Contractual Maturities Of Cash Equivalents And Available-For-Sale Investments (Detail) $ in Millions	Dec. 31, 2017 USD ($)
Amortized Cost
Mature in less than one year	$ 1,320.7
Mature in one to five years	1,898.3
Total	3,219.0
Fair Value
Mature in less than one year	1,317.9
Mature in one to five years	1,885.9
Total	$ 3,203.8

X

- Definition

This item represents the cost of debt securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any.

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Amount after adjustments of available-for-sale debt securities at cost, maturing in the next fiscal year following the latest fiscal year. Adjustments include, but are not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized in earnings less cumulative-effect adjustments, and fair value hedge accounting adjustments. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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